Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4eda9c3f44d5191…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 11:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4ce03172b2585f8d58c6a5b99438c9fc SHA-1: 0e0decb21662d962f35602f2d72874b4f30d34e7 SHA-256: c4eda9c3f44d51911258e09ef873b0c10e27615cecf780d9bc2a4c89db0f9a3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=virtual+dj+home+7+free+download+for+android PDF link annotation
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/be6caa4d3e715cf22f04b4accc246073/79346476131.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/68394604835.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/xixiladoreg.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210913194453.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/93426634868.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/xerarironosex.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/wezobojeposanes.pdfIn PDF document text
    • http://health-bridge.in/upload/file/kagire.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/25490597756.pdfIn PDF document text
    • http://ausafe.net/images/art/files/93218608161.pdfIn PDF document text
    • https://olterus.info/contents/files/50598984917.pdfIn PDF document text
    • http://hybsch.it/upload/file/zobomifufin.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/28166790234.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/wuvuri.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/51375031122.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109052150532742.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/84039302034.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109082129592682.pdfIn PDF document text
    • https://adikmanis.com/contents/files/sapis.pdfIn PDF document text
    • http://pi-consulting.ch/download/sikigifalawoketolem.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/sukexemojolamugomi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/solemudusujaminuwimovepoz.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ac22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 15320 bytes
SHA-256: 3818530641dbe48d9c37f109148b949ea28890d0202433ff048a88dc61c70db0
font_02_sfnt_off0000eaea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEA 10784 bytes
SHA-256: 185d7de58352646f22e987cd2843749bbdef6210450b9a4d86406ac6541b28de

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